4.63

CPP/7zip/Crypto/ZipCrypto.h

@@ -0,0 +1,71 @@
+// Crypto/ZipCrypto.h
+
+#ifndef __CRYPTO_ZIP_CRYPTO_H
+#define __CRYPTO_ZIP_CRYPTO_H
+
+#include "Common/MyCom.h"
+
+#include "../ICoder.h"
+#include "../IPassword.h"
+
+namespace NCrypto {
+namespace NZip {
+
+const unsigned kHeaderSize = 12;
+
+class CCipher
+{
+  UInt32 Keys[3];
+
+  void UpdateKeys(Byte b);
+  Byte DecryptByteSpec();
+public:
+  void SetPassword(const Byte *password, UInt32 passwordLen);
+  Byte DecryptByte(Byte b);
+  Byte EncryptByte(Byte b);
+  void DecryptHeader(Byte *buf);
+  void EncryptHeader(Byte *buf);
+};
+
+class CEncoder :
+  public ICompressFilter,
+  public ICryptoSetPassword,
+  public ICryptoSetCRC,
+  public CMyUnknownImp
+{
+  CCipher _cipher;
+  UInt32 _crc;
+public:
+  MY_UNKNOWN_IMP2(
+      ICryptoSetPassword,
+      ICryptoSetCRC
+  )
+  STDMETHOD(Init)();
+  STDMETHOD_(UInt32, Filter)(Byte *data, UInt32 size);
+
+  STDMETHOD(CryptoSetPassword)(const Byte *data, UInt32 size);
+  STDMETHOD(CryptoSetCRC)(UInt32 crc);
+  HRESULT WriteHeader(ISequentialOutStream *outStream);
+};
+
+
+class CDecoder:
+  public ICompressFilter,
+  public ICryptoSetPassword,
+  public CMyUnknownImp
+{
+  CCipher _cipher;
+public:
+  MY_UNKNOWN_IMP1(ICryptoSetPassword)
+
+  STDMETHOD(Init)();
+  STDMETHOD_(UInt32, Filter)(Byte *data, UInt32 size);
+  STDMETHOD(CryptoSetPassword)(const Byte *data, UInt32 size);
+
+  HRESULT ReadHeader(ISequentialInStream *inStream);
+};
+
+
+}}
+
+#endif